135 lines
4.1 KiB
Fortran
135 lines
4.1 KiB
Fortran
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program ft8code
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! Provides examples of message packing, LDPC(144,87) encoding, bit and
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! symbol ordering, and other details of the FT8 protocol.
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use packjt
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use crc
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include 'ft8_params.f90' !Set various constants
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include 'ft8_testmsg.f90'
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parameter (NWAVE=NN*NSPS)
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character*40 msg,msgchk
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character*37 msg37
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character*6 c1,c2
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character*9 comment
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character*22 msgsent,message
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character*6 mygrid6
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character bad*1,msgtype*10
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character*87 cbits
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logical bcontest
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integer itone(NN)
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integer dgen(12)
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integer*1 msgbits(KK),decoded(KK),decoded0(KK)
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data mygrid6/'EM48 '/
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! Get command-line argument(s)
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nargs=iargc()
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if(nargs.ne.1 .and. nargs.ne.3) then
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print*
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print*,'Program ft8code: Provides examples of message packing, ', &
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'LDPC(174,87) encoding,'
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print*,'bit and symbol ordering, and other details of the FT8 protocol.'
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print*
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print*,'Usage: ft8code [-c grid] "message" # Results for specified message'
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print*,' ft8code -t # Examples of all message types'
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go to 999
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endif
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bcontest=.false.
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call getarg(1,msg) !Message to be transmitted
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if(len(trim(msg)).eq.2 .and. msg(1:2).eq.'-t') then
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testmsg(NTEST+1)='KA1ABC RR73; WB9XYZ <KH1/KH7Z> -11'
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nmsg=NTEST+1
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else if(len(trim(msg)).eq.2 .and. msg(1:2).eq.'-c') then
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bcontest=.true.
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call getarg(2,mygrid6)
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call getarg(3,msg)
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msgchk=msg
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nmsg=1
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else
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msgchk=msg
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call fmtmsg(msgchk,iz) !To upper case; collapse multiple blanks
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nmsg=1
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endif
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write(*,1010)
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1010 format(" Message Decoded Err? Type"/76("-"))
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do imsg=1,nmsg
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if(nmsg.gt.1) msg=testmsg(imsg)
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call fmtmsg(msg,iz) !To upper case, collapse multiple blanks
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msgchk=msg
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! Generate msgsent, msgbits, and itone
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if(index(msg,';').le.0) then
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call packmsg(msg(1:22),dgen,itype,bcontest)
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msgtype=""
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if(itype.eq.1) msgtype="Std Msg"
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if(itype.eq.2) msgtype="Type 1 pfx"
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if(itype.eq.3) msgtype="Type 1 sfx"
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if(itype.eq.4) msgtype="Type 2 pfx"
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if(itype.eq.5) msgtype="Type 2 sfx"
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if(itype.eq.6) msgtype="Free text"
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i3bit=0
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call genft8(msg(1:22),mygrid6,bcontest,i3bit,msgsent,msgbits,itone)
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else
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call foxgen_wrap(msg,msgbits,itone)
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i3bit=1
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endif
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decoded=msgbits
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i3bit=4*decoded(73) + 2*decoded(74) + decoded(75)
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iFreeText=decoded(57)
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decoded0=decoded
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if(i3bit.eq.1) decoded(57:)=0
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call extractmessage174(decoded,message,ncrcflag)
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decoded=decoded0
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if(i3bit.eq.0) then
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if(bcontest) call fix_contest_msg(mygrid6,message)
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bad=" "
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comment=' '
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if(itype.ne.6 .and. message.ne.msgchk) bad="*"
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if(itype.eq.6 .and. message(1:13).ne.msgchk(1:13)) bad="*"
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if(itype.eq.6 .and. len(trim(msgchk)).gt.13) comment='truncated'
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write(*,1020) imsg,msgchk,message,bad,i3bit,itype,msgtype,comment
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1020 format(i2,'.',1x,a22,1x,a22,1x,a1,2i2,1x,a10,1x,a9)
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else
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write(cbits,1001) decoded
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1001 format(87i1)
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read(cbits,1002) nrpt
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1002 format(66x,b6)
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irpt=nrpt-30
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i1=index(message,' ')
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i2=index(message(i1+1:),' ') + i1
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c1=message(1:i1)//' '
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c2=message(i1+1:i2)//' '
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msg37=c1//' RR73; '//c2//' <...> '
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write(msg37(35:37),1003) irpt
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1003 format(i3.2)
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if(msg37(35:35).ne.'-') msg37(35:35)='+'
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iz=len(trim(msg37))
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do iter=1,10 !Collapse multiple blanks into one
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ib2=index(msg37(1:iz),' ')
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if(ib2.lt.1) exit
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msg37=msg37(1:ib2)//msg37(ib2+2:)
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iz=iz-1
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enddo
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write(*,1021) imsg,msgchk,msg37
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1021 format(i2,'.',1x,a40,1x,a37)
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endif
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enddo
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if(nmsg.eq.1) then
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write(*,1030) msgbits(1:56)
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1030 format(/'Call1: ',28i1,' Call2: ',28i1)
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write(*,1032) msgbits(57:72),msgbits(73:75),msgbits(76:87)
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1032 format('Grid: ',16i1,' 3Bit: ',3i1,' CRC12: ',12i1)
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write(*,1034) itone
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1034 format(/'Channel symbols:'/79i1)
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endif
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999 end program ft8code
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